CVE-2026-72848Public exploitNetwork attack vector

Internal response disclosure via nested sitemap fetch

Published Aug 20, 2026 · Updated Aug 20, 2026

Server-side request forgery in LangChain Community 0.4.2 and earlier allows attackers to read internal HTTP responses via crafted sitemaps. In SitemapLoader.parse_sitemap, the same-domain check runs on url loc entries, but nested sitemap loc values are passed directly to scrape_all(), which reaches aiohttp GET with no domain or private-address validation. Exposure requires an application to ingest attacker-influenced sitemap content; when that workflow is reachable, returned Documents can disclose fetched intranet or cloud-metadata content.

CVSS severity7.7
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in LangChain Community 0.4.2 and earlier allows attackers to read internal HTTP responses via crafted sitemaps. In SitemapLoader.parse_sitemap, the same-domain check runs on url loc entries, but nested sitemap loc values are passed directly to scrape_all(), which reaches aiohttp GET with no domain or private-address validation. Exposure requires an application to ingest attacker-influenced sitemap content; when that workflow is reachable, returned Documents can disclose fetched intranet or cloud-metadata content.

The record

CVE
CVE-2026-72848
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
LangChain
Product
LangChain Community
Classifications
CWE-918, T1190
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=0.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

LangChain · LangChain Communityversion=0 <=0.4.2

Published CVSS scores

7.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N
8.6VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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